package com.jy.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.jy.reggie.common.BaseContext;
import com.jy.reggie.common.R;
import com.jy.reggie.entity.ShoppingCart;
import com.jy.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        //设置用户id
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前的菜品或套餐是否在购物车里面
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        
        if(dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        //如果已经存在，则+1
        if(cartServiceOne!=null){
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不在则添加到购物车，数量默认为1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne=shoppingCart;
        }
        return R.success(cartServiceOne);
    }


    /**
     * 减少购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        //设置用户id
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前的菜品或套餐
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if(dishId!=null){
            //减少的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //减少的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        //如果菜品或套餐>1，则-1
        if(cartServiceOne.getNumber()>1){
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果菜品或套餐=1，则删除
            shoppingCartService.removeById(cartServiceOne);
            shoppingCart.setNumber(0);
            cartServiceOne=shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        Long currentId = BaseContext.getCurrentId();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        queryWrapper.orderByDesc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }


    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
}
